It's not a crwth. It has too many strings, it doesn't have the gizmo where the strap attaches, and the woman who owned it was a serious violinist and would not have lost the bow. She lived in the same house from 1956 to 2021, and so she couldn't have lost it moving.

Nonetheless, here's a cool video of somebody playing a crwth:

https://www.youtube.com/watch?v=7yYg_7cm0Rs

In Welsh, w can make an oo sound, so crwth rhymes with root.